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RISS 인기검색어
- 검색키워드
- 저자 : Gitae Namgung (검색결과 4 건)
- 무료
- 기관 내 무료
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Namgung, Gitae,Ta, Qui Thanh Hoai,Noh, Jin-Seo Elsevier 2018 Chemical physics letters Vol.703 No.-
<P><B>Abstract</B></P> <P>Stretchable hydrogen sensors were fabricated from Pd nanosheets that were transferred onto a PDMS substrate. To prepare the Pd nanosheets, a Pd thin film on PDMS was first biaxially stretched and then PDMS substrate was etched off. The size of Pd nanosheets decreased as the applied strain increased and the film thickness decreased. A transfer technique was utilized to implement the stretchable hydrogen sensors. The stretchable sensors exhibited negative response behaviors upon the exposure to hydrogen gas. Interestingly, the sensors worked even under large strains up to 30%, demonstrating a potential as a high-strain-tolerable hydrogen sensor for the first time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Palladium (Pd) nanosheets were prepared by a combination of biaxial stretching and PDMS delamination. </LI> <LI> The size of Pd nanosheets could be controlled by adjusting the applied strain and film thickness. </LI> <LI> Stretchable hydrogen gas sensors were fabricated using the Pd nanosheets. </LI> <LI> The stretchable sensors responded to hydrogen gas even under a 30% strain. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Pd nanosheets were prepared by biaxially stretching a Pd film on PDMS and subsequently delaminating the PDMS. It was demonstrated that stretchable hydrogen sensors fabricated from the Pd nanosheets could respond to hydrogen gas even under large strains up to 30%.</P> <P>[DISPLAY OMISSION]</P>
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Morphological evolution of solution-grown cobalt-doped ZnO nanostructures and their properties
Ta, Qui Thanh Hoai,Namgung, Gitae,Noh, Jin-Seo Elsevier 2018 Chemical physics letters Vol.700 No.-
<P><B>Abstract</B></P> <P>It is demonstrated that the morphology of Co-doped ZnO nanostructures can be easily altered by controlling Co-doping concentration. A facile low-temperature solution method was employed for the nanosynthesis. The morphology of the nanostructures changed from nanorods to nanoparticles, and to needle-like structures as the molar ratio of Co<SUP>2+</SUP> ions increased. No noticeable changes in structural and optical properties were caused by the low concentration of Co-doping, while a magnetic transition was observed. At the very low Co concentrations below 0.3 at%, the nanostructures showed diamagnetism, whereas a paramagnetic behavior was observed at a concentration of 2.5 at%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co-doped ZnO nanostructures were synthesized by a low-temperature solution method. </LI> <LI> The morphology of the nanostructures could be controlled simply by adjusting the Co<SUP>2+</SUP> concentration. </LI> <LI> No noticeable changes in structural and optical properties were caused by the morphological evolution. </LI> <LI> The Co-doped ZnO nanostructures showed paramagnetism at the Co concentration of 2.5 at%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Qui Thanh Hoai Ta,Gitae Namgung,Jin-Seo Noh 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.6
In this work, graphitic carbon nitride (g-C3N4) was synthesized by simple pyrolysis of melamine, and it was hybridized withreduced graphene oxide (rGO) and silver nanoparticles (AgNPs) using a stepwise solution method. AgNPs were randomlydistributed on the surface of rGO/g-C3N4 layered hybrid structure, forming Ag@rGO/g-C3N4 composite. It was disclosedthat the Ag@rGO/g-C3N4 composite responded to both oxidizing and reducing gases at room temperature, and its responsewas greatly enhanced from those of pristine rGO and rGO/g-C3N4. The room temperature responses of the composite wereestimated at − 95% and 8% for 50 ppm of NO2and NH3,respectively. The roles of structural components were discussed, anda gas-sensing mechanism was proposed based on the respective roles. In particular, AgNPs turned out to play an importantrole in the gas-sensing activity.
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Sreedhar, Adem,Neelakanta Reddy, I.,Ta, Qui Thanh Hoai,Namgung, Gitae,Noh, Jin-Seo Elsevier 2019 Journal of Electroanalytical Chemistry Vol.832 No.-
<P><B>Abstract</B></P> <P>Silver nanowires (AgNWs) functionalized ZnO flake-like (ZnO/AgNWs) morphological heterostructures were developed as a promising photoanode by facile RF magnetron sputtering and polyol methods. Herein, we demonstrate the role of rationally tailored AgNWs weight concentration (0, 0.03, 0.05 and 0.07g) on ZnO flake-like morphology for enhanced visible-light-driven photoelectrochemical (PEC) water splitting activity. From XRD studies, ZnO (002) facets were effectively influenced by the selective growth of Ag (111) facets. Notably, XPS studies reveal the strong correlation between AgNWs and ZnO, showing a significant red shift in Zn 2p and O 1s levels and blue shift in Ag 3d level. Whereas, surface hydroxyl groups (OH<SUP>−</SUP>) were originated on ZnO/AgNWs heterostructure, which acts as light trapping states. Interestingly, FESEM images comprise AgNWs distribution on ZnO flake-like morphology, which suggests AgNWs are most accessible networks at the interface of ZnO. As a result, we observed significant variation in the optical transmittance and matching band gap for strong visible light absorption. In conclusion, selective growth of AgNWs-0.05g on ZnO promoted the strong interface reaction kinetics with impressive photoconversion efficiency (0.38%). Thus, developing of unique flake-like/nanowire morphological features underlined to be crucial interest in energy conversion applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Well-defined AgNWs based ZnO flake-like photoanodes reported for the first time. </LI> <LI> Surface interaction between AgNWs and ZnO serves as a key factor for PEC activity. </LI> <LI> Specific surface area of AgNWs achieved for superior visible light harvesting. </LI> <LI> ZnO/AgNWs (0.05g) photoanodes yielded 0.38% photoconversion efficiency. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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